The old wiring can just, be set aside and not hooked up to coil or EUC. That way you have a spare ignition in case the C.D. fails. The C.D. is wired to the battery and always on. The coil resistor may be used to feed the small red wire, (use the coil wire from the run side of the resistor) since it will not carry current for the CD, and is used only to turn it on with the key. If you want a fool proof way to eliminate current to the capacitors in the box, remove the negative battery. Now there is no way a spark can be generated from a charged Cap. Those sound system mega caps are also a hazard, and may ignite gasoline spills during a wreck or collision.